Until recently the battle to avert catastrophic climate change seemed to be lost. But with the tipping point just years away, the tide is finally turning, thanks to innovations ranging from cheap renewables to lab-grown meat and electric airplanes

According to Moran Cerf, a neuroscientist at Northwestern University who has been studying decision-making for over a decade, the surest way to maximise happiness has nothing to do with experiences, material goods, or personal philosophy.